:root{
  --bg-1: #0f1724;
  --bg-2: #122031;
  --glass: rgba(255,255,255,0.06);
  --glass-2: rgba(255,255,255,0.08);
  --accent: #01afff;
  --accent-2: #7bd3ff;
  --muted: rgba(255,255,255,0.6);
  --danger: #ff6b6b;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  background: linear-gradient(135deg,var(--bg-1), var(--bg-2));
  color: #e9f0f6;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}

/* App container */
.app{
  width:100%;
  max-width:1100px;
}

/* Topbar */
.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  margin-bottom:18px;
  width: 100%;
}

.brand{
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.brand h1{
  margin:0;
  font-size:36px;
  font-weight:700;
  letter-spacing:4px;
  color: rgba(255,255,255,0.95);
  text-shadow: 
    0 0 20px rgba(255,255,255,0.3),
    0 2px 4px rgba(0,0,0,0.3);
  display: inline-block;
  font-family: 'Orbitron', 'Inter', 'Segoe UI', system-ui, sans-serif;
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.04));
  padding: 6px 16px;
  border-radius: 10px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 
    0 4px 16px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.15);
  width: fit-content;
}

.brand h1::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-2), transparent);
  opacity: 0.4;
}

.subtitle{
  font-size:12px;
  color: rgba(255,255,255,0.5);
  font-weight:400;
  letter-spacing:1.5px;
  margin-top:0;
  margin-left: 2px;
  opacity:1;
  display: block;
  text-transform: uppercase;
}

/* Footer */
.footer {
  width: 100%;
  text-align: center;
  padding: 20px;
  margin-top: 20px;
}

.footer .subtitle {
  margin: 0;
}

/* Controls */
.controls{
  display:flex;
  gap:12px;
  align-items:center;
}
.controls .mode{display:flex;flex-direction:column;align-items:flex-end;font-size:12px;color:var(--muted)}
.controls select{
  padding:6px 10px;border-radius:8px;border:none;background:rgba(255,255,255,0.05);color:inherit;
  outline:none;
}

/* Theme switch */
.switch{position:relative;display:inline-block;width:46px;height:26px}
.switch input{opacity:0;width:0;height:0}
.slider{
  position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,0.12);
  transition:.25s;border-radius:26px;
}
.slider:before{
  content:"";position:absolute;height:20px;width:20px;left:3px;top:3px;background:white;border-radius:50%;transition:.25s;
}
.switch input:checked + .slider{background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.switch input:checked + .slider:before{transform:translateX(20px)}

/* Main layout */
.main{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap:20px;
  align-items:start;
}

/* Glass panel */
.glass{
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border-radius:14px;
  padding:14px;
  box-shadow: 0 8px 30px rgba(2,6,23,0.6), inset 0 1px 0 rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.04);
}

/* Scoreboard */
.scoreboard{display:flex;flex-direction:column;gap:12px}
.score-row{display:flex;align-items:center;gap:10px;justify-content:space-between}
.player{display:flex;gap:12px;align-items:center}
.player .avatar{
  width:54px;height:54px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:20px;color:#0b1320;
  background:linear-gradient(180deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 18px rgba(11,19,32,0.5);
}
.player .name{font-size:14px}
.player .score{font-size:20px;font-weight:700;color:var(--accent-2)}

/* Versus */
.versus{font-weight:700;color:var(--muted)}

/* turn and buttons */
.status-row{display:flex;gap:12px;align-items:center;justify-content:space-between}
.turn-indicator{
  padding:8px 10px;border-radius:10px;font-size:14px;color:var(--muted);display:flex;align-items:center;gap:8px;
}
.turn-indicator span{font-weight:700;color:var(--accent-2);padding:4px 8px;border-radius:6px;background:rgba(255,255,255,0.03)}

/* Buttons */
.btn{
  padding:10px 14px;border-radius:10px;border:none;background:linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  color:inherit;font-weight:600;cursor:pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(0,0,0,0.35)}
.btn.secondary{background:transparent;border:1px solid rgba(255,255,255,0.04)}

/* Notes */
.notes.small{font-size:13px;color:var(--muted);margin-top:10px}

/* Board panel */
.board-panel{display:flex;align-items:center;justify-content:center}
.board-wrap{display:flex;align-items:center;justify-content:center;padding:12px}
.board{
  width: min(64vmin, 520px);
  height: min(64vmin, 520px);
  display:grid;
  grid-template-columns: repeat(3,1fr);
  gap:14px;
  position:relative;
  padding:20px;
  border-radius:18px;
  align-items:center;justify-items:center;
}

/* Boxes */
.box{
  width:100%;
  height:100%;
  aspect-ratio:1/1;
  border-radius:14px;
  border:none;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  backdrop-filter: blur(6px);
  color:transparent;
  font-size: clamp(28px, 6vmin, 64px);
  font-weight:800;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  box-shadow: 0 8px 20px rgba(2,6,23,0.6);
  transition: transform .15s ease, background .18s ease, box-shadow .18s ease, color .15s ease;
  position:relative;
  overflow:visible;
}

/* X/O styles */
.box.x { color: #00ffd5; text-shadow: 0 6px 24px rgba(0,255,213,0.12); }
.box.o { color: #ffd37b; text-shadow: 0 6px 24px rgba(255,211,123,0.12); }

/* Pop-in animation when placed */
.pop-in{
  animation: pop .28s cubic-bezier(.2,.8,.2,1) forwards;
}
@keyframes pop{
  0%{ transform: scale(.2) rotate(-12deg); opacity:0 }
  60%{ transform: scale(1.08) rotate(6deg); opacity:1 }
  100%{ transform: scale(1) rotate(0) }
}

/* When hover and available */
.box:hover{ transform: translateY(-6px) scale(1.02); box-shadow: 0 16px 40px rgba(0,0,0,0.7)}

/* disabled look */
.box:disabled{ cursor:default; opacity:0.75; transform:none; }

/* winning highlight for individual boxes */
.box.win {
  box-shadow: 0 12px 40px rgba(123,211,153,0.25);
  transform: scale(1.05);
}

/* win-line overlay */
.win-line{
  position:absolute;
  height:8px;
  background: linear-gradient(90deg, rgba(123,211,153,0.95), rgba(123,211,255,0.95));
  border-radius:8px;
  left:0;top:0;
  transform-origin:center;
  transition:opacity .18s ease, transform .18s ease;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  z-index:10;
  pointer-events:none;
}
.hidden{display:none}

/* Modal */
.modal{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  backdrop-filter: blur(6px); background: rgba(0,0,0,0.45); z-index:40;
}
.modal-card{padding:22px;border-radius:14px;text-align:center;min-width:280px}
.result-text{font-size:20px;margin-bottom:12px;font-weight:700;color:var(--accent-2)}

/* Light theme overrides */
/* body.theme-light{
  --bg-1: #e9f1f5;
  --bg-2: #f8fbfc;
  --glass: rgba(9,14,18,0.03);
  --glass-2: rgba(9,14,18,0.02);
  --accent: #2a9d8f;
  --accent-2: #4cc9f0;
  --muted: rgba(11,19,32,0.7);
  color: #07192b;
}
body.theme-light .box{ background: linear-gradient(180deg, rgba(0,0,0,0.02), rgba(0,0,0,0.01)); }
body.theme-light .brand h1{ color: #07192b }
body.theme-light .subtitle{ color: rgba(11,19,32,0.6) }
body.theme-light .player .avatar{ color:#07192b } */

/* Responsive */
@media (max-width:880px){
  .main{grid-template-columns: 1fr;align-items:center}
  .topbar{flex-direction:column;align-items:flex-start;gap:10px}
  .board{width: min(88vmin, 520px); height: min(88vmin, 520px)}
  
  .brand h1 {
    font-size: 26px;
  }
  
  .controls {
    width: 100%;
  }
  
  .mode-buttons {
    width: 100%;
  }
}

.controls .mode {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin-top: 4px;
}

.controls .mode label {
    font-size: 12px;
    color: var(--muted);
    display: block;
    margin-left: 2px;
}

.mode-buttons {
  display: flex;
  gap: 10px;
  padding: 6px;
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  backdrop-filter: blur(6px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.mode-btn {
  flex: 1;
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  background: rgba(255,255,255,0.08);
  color: #d8e6f3;
  transition: 
      background 0.25s ease,
      transform 0.15s ease,
      box-shadow 0.2s ease;
}

.mode-btn:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.15);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.mode-btn.active {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: #0d1927;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  transform: translateY(-2px);
}


.modal.hidden {
    display: none;
}

/* Confirmation Modal */
.confirm-card {
  max-width: 400px;
  padding: 28px;
}

.confirm-icon {
  font-size: 48px;
  text-align: center;
  margin-bottom: 16px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.confirm-title {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  color: var(--accent-2);
  margin-bottom: 12px;
}

.confirm-message {
  font-size: 14px;
  text-align: center;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.btn.danger {
  background: linear-gradient(180deg, #ff6b6b, #ee5a5a);
  color: white;
  font-weight: 700;
}

.btn.danger:hover {
  background: linear-gradient(180deg, #ff5252, #dd4444);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255,107,107,0.4);
}

/* Confetti Animation */
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  top: -10px;
  z-index: 100;
  animation: confetti-fall linear forwards;
  border-radius: 2px;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

@media (max-width: 780px) {
  body {
    padding: 16px 12px;
    align-items: flex-start;
  }
  
  .app {
    padding-top: 8px;
  }

  .brand {
    display: inline-flex;
    margin-bottom: 4px;
  }

  .brand h1 {
    font-size: 26px;
    letter-spacing: 2px;
    display: inline-block;
    width: auto;
    padding: 5px 12px;
    border-radius: 8px;
  }
  
  .subtitle {
    font-size: 12px;
    margin-top: 4px;
    display: block;
    color: #b8d4e8;
    opacity: 0.9;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 14px;
    margin-bottom: 16px;
  }
  
  .controls {
    width: 100%;
    flex-direction: column;
    gap: 10px;
  }
  
  .mode-buttons {
    width: 100%;
    padding: 5px;
    gap: 8px;
  }
  
  .mode-btn {
    flex: 1;
    padding: 10px 12px;
    font-size: 13px;
  }

  .main {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .left-panel,
  .board-panel {
    width: 100%;
  }

  .scoreboard {
    padding: 12px;
  }
  
  .score-row {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: space-around;
    align-items: center;
  }
  
  .player {
    flex: 0 0 auto;
    min-width: 120px;
    gap: 10px;
    justify-content: flex-start;
  }
  
  .player.p1 {
    order: 1;
  }
  
  .player.p2 {
    order: 3;
  }
  
  .player .avatar {
    width: 48px;
    height: 48px;
    font-size: 18px;
  }
  
  .player .name {
    font-size: 13px;
  }
  
  .player .score {
    font-size: 18px;
  }
  
  .versus {
    flex: 0 0 auto;
    text-align: center;
    font-size: 16px;
    margin: 0 8px;
    order: 2;
  }

  .status-row {
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
  }
  
  .turn-indicator {
    width: 100%;
    justify-content: center;
    padding: 10px;
  }
  
  .buttons {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 8px;
  }

  .btn {
    width: 100%;
    padding: 12px 14px;
  }
  
  .notes.small {
    font-size: 12px;
    padding: 12px;
  }
  
  .notes.small ul {
    padding-left: 18px;
    margin: 8px 0 0 0;
  }
  
  .notes.small li {
    margin-bottom: 6px;
  }

  .board {
    width: min(92vw, 450px);
    height: min(92vw, 450px);
    gap: 10px;
    padding: 12px;
  }

  .box {
    border-radius: 10px;
    font-size: clamp(32px, 12vw, 56px);
  }
  
  .modal-card {
    width: 90%;
    max-width: 320px;
    padding: 20px;
  }
  
  .result-text {
    font-size: 18px;
  }
  
  .modal-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .modal-actions .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  body {
    padding: 12px 8px;
    align-items: flex-start;
  }
  
  .brand h1 {
    font-size: 24px;
    letter-spacing: 1px;
    display: block;
  }
  
  .subtitle {
    font-size: 11px;
    display: block;
    color: #b8d4e8;
  }
  
  .mode-btn {
    font-size: 12px;
    padding: 9px 10px;
  }
  
  .player {
    min-width: 120px;
    gap: 8px;
  }
  
  .player .avatar {
    width: 42px;
    height: 42px;
    font-size: 16px;
  }
  
  .player .name {
    font-size: 12px;
  }
  
  .player .score {
    font-size: 16px;
  }
  
  .board {
    width: min(94vw, 380px);
    height: min(94vw, 380px);
    gap: 8px;
    padding: 10px;
  }
  
  .box {
    border-radius: 8px;
    font-size: clamp(28px, 11vw, 48px);
  }
  
  .btn {
    padding: 11px 12px;
    font-size: 14px;
  }
}